Current Control Of Linear Piston Drive Motor Patents (Class 303/162)
-
Patent number: 11821953Abstract: A variable reluctance motor load mapping apparatus includes a frame, an interface disposed on the frame configured for mounting a variable reluctance motor, a static load cell mounted to the frame and coupled to the variable reluctance motor, and a controller communicably coupled to the static load cell and the variable reluctance motor, the controller being configured to select at least one motor phase of the variable reluctance motor, energize the at least one motor phase, and receive motor operational data from at least the static load cell for mapping and generating an array of motor operational data look up tables.Type: GrantFiled: November 23, 2021Date of Patent: November 21, 2023Assignee: Brooks Automation US, LLCInventors: Jairo T Moura, Nathan Spiker, Aaron Gawlik, Jayaraman Krishnasamy
-
Patent number: 11731638Abstract: A driving assistance apparatus includes a processor having hardware. The processor is configured to acquire vehicle speed data before an ABS of a vehicle is activated and vehicle speed data when the ABS of the vehicle is stopped, calculate a coefficient of sliding friction based on the vehicle speed data before the ABS is activated and the vehicle speed data when the ABS is stopped, determine whether the coefficient of sliding friction is equal to or smaller than a threshold, and detect that a slip due to road freezing has occurred when the coefficient of sliding friction is equal to or smaller than the threshold.Type: GrantFiled: July 12, 2021Date of Patent: August 22, 2023Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO TEN LimitedInventors: Hidetsugu Higuchi, Hiromi Tonegawa, Kenji Tsumura, Hideaki Miyazaki
-
Patent number: 11181582Abstract: A variable reluctance motor load mapping apparatus includes a frame, an interface disposed on the frame configured for mounting a variable reluctance motor, a static load cell mounted to the frame and coupled to the variable reluctance motor, and a controller communicably coupled to the static load cell and the variable reluctance motor, the controller being configured to select at least one motor phase of the variable reluctance motor, energize the at least one motor phase, and receive motor operational data from at least the static load cell for mapping and generating an array of motor operational data look up tables.Type: GrantFiled: February 18, 2020Date of Patent: November 23, 2021Assignee: Brooks Automation, Inc.Inventors: Jairo T. Moura, Nathan Spiker, Aaron Gawlik, Jayaraman Krishnasamy
-
Patent number: 10737670Abstract: A brake fluid pressure control device for a vehicle that can perform fluid pressure control on the brake fluid pressure applied to wheel brakes. It is determined whether the pressure increasing time in the current pressure increasing control exceeds determination time which is set on the basis of the pressure increasing time in past pressure increasing control. If the pressure increasing time in the current pressure increasing control exceeds the determination time, it is determined that the road surface on which the vehicle is travelling has changed from the road surface with a low coefficient of friction to the road surface with a high coefficient of friction.Type: GrantFiled: February 28, 2017Date of Patent: August 11, 2020Assignee: NISSIN KOGYO CO., LTD.Inventors: Masahiro Toyoda, Teruyoshi Yamakawa
-
Patent number: 10300895Abstract: A brake device having an electric parking brake function, capable of appropriately performing stepwise increase control for a clamping force. A control unit including a computing circuit (20), a memory (21), and each motor drive circuit (23) of a parking brake control device (19) includes a stepwise increase control unit configured to increase the clamping force generated by brake pads (33) to a disc rotor (4) in a stepwise manner. When start of contact between the disc rotor (4) and the brake pads (33) caused by feeding of power from the parking brake control device (19) to an electric motor (43B) is detected based on a motor current from a current sensor unit (24), the stepwise increase control unit performs control for repeatedly feeding and stopping power to the electric motor (43B) to increase the clamping force in a stepwise manner in accordance with a predefined processing procedure.Type: GrantFiled: December 25, 2015Date of Patent: May 28, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Tatsuro Kobune, Wataru Yokoyama, Kenichiro Matsubara
-
Patent number: 10293798Abstract: A brake system for a vehicle may include a primary braking system, a backup braking system, and a braking system controller. The primary braking system may apply braking energy to wheels of the vehicle. The backup braking system may include a master cylinder configured to supply braking energy to one or more of the wheels of the vehicle. The braking system controller may be configured to select a mode of backup braking based on a functional state of the primary braking system. The braking system controller may control the master cylinder to supply braking energy to less than all of the wheels of the vehicle in a first mode of backup braking and supply the braking energy to all of the wheels of the vehicle in a second mode of backup braking. A parking brake may assist the backup braking system by utilizing proportional braking in a backup braking mode.Type: GrantFiled: March 24, 2014Date of Patent: May 21, 2019Assignee: FORD GLOBAL TECHNOLOGIES, LLCInventors: Brad J. Johnson, Chad M. Korte, Dale S. Crombez
-
Patent number: 9495182Abstract: A method and architecture of reconfiguring software mode management for a system. A prior status mode of a subsystem is identified. The primary controller includes a primary software algorithm for maintaining operations of the subsystem. A mode determination logic function is retrieved in a table for determining whether a mode change occurred. The mode determination logic function associated with the prior mode is executed. A current mode is determined from the table based on results from the execution of the mode determination logic function. An action list associated with the identified current mode in the table is identified. The action list identifies functions for transitioning the nodes from the prior mode to the current node. An action list associated with the current mode including a list of action functions for transitioning the previous mode to the current mode is executed. The table is independently modifiable from the primary software mode management algorithm.Type: GrantFiled: February 3, 2015Date of Patent: November 15, 2016Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Chang Liu, Shige Wang
-
Patent number: 9340186Abstract: A system for controlling release of an automatic parking brake device onboard an automobile, that includes a transmission mechanism transmitting an instruction several times for releasing the parking brake device, and an interface provided between the transmissions of the release instruction and for transmitting a release instruction of the parking brake device.Type: GrantFiled: August 18, 2008Date of Patent: May 17, 2016Assignee: RENAULT S.A.S.Inventors: Christophe Desfriches, Pascal Febrer, Alessandro Monti
-
Patent number: 9233666Abstract: A vehicle includes both a transmission park mechanism and an electronic parking brake. As a failure management strategy, a controller monitors vehicle movement to verify that the park mechanism is successfully restraining the vehicle against movement. Specifically, when the driver releases the brake pedal with the transmission park mechanism commanded to restrain the vehicle, the controller waits for a predetermined amount of time. If the vehicle moves during this time, the controller commands application of the electronic parking brake. The controller may also command application of the electronic parking brake if the vehicle does not come to a stop after the transmission park mechanism is commanded to restrain the vehicle.Type: GrantFiled: June 3, 2014Date of Patent: January 12, 2016Assignee: Ford Global Technologies, LLCInventors: Emad Al-Regib, Brian J. Deurloo, Todd Curtis Spaulding, Derek Kinch, Jeffrey James Tumavitch, Richard Reynolds Hathaway
-
Patent number: 8864244Abstract: The invention relates to a hydraulic brake system comprising a master brake cylinder the at least one working chamber of which is connected to the wheel brakes of the vehicle via at least one hydraulic line, the brake piston of at least one wheel brake being adjustable by a negative pressure in the hydraulic lines to produce a brake clearance.Type: GrantFiled: December 22, 2008Date of Patent: October 21, 2014Assignee: Ipgate AGInventors: Heinz Leiber, Valentin Unterfrauner
-
Patent number: 8794716Abstract: Brake fluid pressure control apparatus includes: fluid pressure passage from a fluid pressure source to a wheel brake; pressure regulating valve arranged on the passage; pump for feeding pressurized brake fluid to the passage between the valve and the wheel brake; motor for driving the pump; and controller which controls an electric current applied to the valve in accordance with target fluid pressure for the wheel brake to control fluid pressure supplied to the wheel brake. The controller includes: means for converting the target fluid pressure into fluid volume and calculating required flow rate from this fluid volume; means for calculating required rotation speed of the motor from the required flow rate and on the basis of efficiency of the pump; and means for increasing the electric current applied to the valve for a predetermined value when the required rotation speed exceeds actual rotation speed of the motor.Type: GrantFiled: June 26, 2008Date of Patent: August 5, 2014Assignees: Nissin Kogyo Co., Ltd., Honda Motor Co., Ltd.Inventors: Nobuyuki Nomura, Ryoji Mori
-
Patent number: 8370032Abstract: Systems and methods for shift control for vehicular transmission. A transmission may shift gears at designated transmission shift points. When the slope of the road grade encountered by a vehicle changes, the transmission shift points may be altered to provide better vehicle performance. According to one embodiment, road slope may be calculated based upon vehicle acceleration and acceleration caused by pedal depression. In such an embodiment, brake indication may be calculated from the same road slope calculation without the use of a brake signal switch. If brake application is indicated by the road slope calculation, transmission shifting may be adjusted to prevent poor vehicle performance.Type: GrantFiled: July 12, 2007Date of Patent: February 5, 2013Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.Inventors: Jordan Choby, Ken Mathis
-
Patent number: 7857399Abstract: An anti-skid control apparatus controls the value of electric current, which is being applied to the first solenoid valve and equal to or greater than the predetermined electric current value, to a value of electric current corresponding to the pressure difference between the master cylinder pressure and the wheel cylinder pressure at a time point where the pressure-increasing control is started; and changes the value of electric current in a direction to be reduced for a first period of time during the pressure-increasing control as the estimated amount of the wheel cylinder pressure reduced by the pressure-reducing control is increased, when the estimated amount of the wheel cylinder pressure reduced by the pressure-reducing control is equal to or greater than a predetermined value.Type: GrantFiled: June 18, 2007Date of Patent: December 28, 2010Assignee: Advics Co., Ltd.Inventors: Yoshiaki Kito, Katsuo Obai
-
Patent number: 7849976Abstract: An electro-mechanical brake achieves a safe traveling and braking with a high accuracy device for detecting a piston position at which a brake pad and a disk rotor contact each other. A pad contact position detecting device in which an electric circuit is not formed to prevent an electric current from flowing therethrough when a pad pressing force is not generated and the electric circuit is formed to enable the electric current to flow therethrough when the pad pressing force is generated is applied to the electro-mechanical brake. A pad contact position can thereby be detected accurately.Type: GrantFiled: June 20, 2006Date of Patent: December 14, 2010Assignee: Hitachi, Ltd.Inventors: Yoshinari Kawahara, Atsushi Yokoyama, Hiroyuki Saito
-
Patent number: 7850255Abstract: The invention provides an electro-mechanical brake system which can keep a stop state even if a malfunction is generated in a parking brake, and an electro-mechanical brake apparatus used for the electro-mechanical brake system. An electro-mechanical brake actuator presses a brake pad to a disc rotor so as to independently brake a braking force of each of wheels. A parking brake is constituted by a pawl portion attached to a motor of a motor driving the electro-mechanical actuator and a latch. A main controller detects a failure of the parking brake on the basis of a motor displacement at a time of reducing a motor current, and increases the pressing force in the remaining normal parking brake in the case that the parking brake failure in one wheel or more is detected.Type: GrantFiled: November 15, 2006Date of Patent: December 14, 2010Assignee: Hitachi, Ltd.Inventors: Yoshinari Kawahara, Atsushi Yokoyama, Satoru Kuragaki, Hirotaka Oikawa, Kenji Hiraku
-
Patent number: 7784881Abstract: The present invention relates to a method for reducing deviations between the effective current and the measured current in a pulse-width-modulated current control, in particular for electronic brake control units of motor vehicles, wherein the measured current is determined at a certain predefined time within an actuation period and a compensation occurs by means of temperature-responsive and/or supply-voltage-responsive compensation variables which are added to the measured current such that a corrected nominal current is available for current control. The invention also relates to a circuit arrangement for actuating several inductive loads and comprises a circuit for PWM control of the load current. The method of the invention is implemented as a program in a microcomputer or microcomputer system that is electrically connected to the PWM circuit.Type: GrantFiled: February 26, 2003Date of Patent: August 31, 2010Assignee: Continental Teves AG & Co. oHGInventors: Mario Engelmann, Peter Oehler
-
Publication number: 20100194187Abstract: A safety apparatus for a rider motivated wheeled vehicle, the safety apparatus including a remote control module and a remotely actuable braking apparatus. The remote control module includes an electronic control signal activation module, a manual signal activator coupled for activating the electronic control signal activation module for generating a control signal, and a power supply coupled for powering the electronic control signal activation module. The remotely actuable braking apparatus includes an auxiliary brake device that is positionable for engaging at least one wheel of a rider motivated wheeled vehicle; an electronic actuator module coupled to the auxiliary brake device and being responsive to a received control signal for operating the auxiliary brake device, and a power supply coupled for powering the actuator module.Type: ApplicationFiled: February 5, 2009Publication date: August 5, 2010Inventor: Lindsay Howard
-
Patent number: 7699409Abstract: The similarity groups of the pressure differential—current characteristics of solenoid valves are measured in advance, and the measurement results are used to select the solenoid valves to be used for first to fourth pressure increase control valves. Only solenoid valves in the same region in terms of their similarity group of the pressure differential—current characteristics are used for the first to fourth pressure increase control valves. A board on which the first to fourth control valves are mounted is provided with a mark unit that indicates the similarity group of the pressure differential—current characteristics of the first to forth pressure increase control valves. The mark unit includes a resistor. A brake ECU uses the resistance value of the resistor to identify the similarity group of the pressure differential—current characteristics of the first to fourth pressure increase control valves.Type: GrantFiled: March 23, 2006Date of Patent: April 20, 2010Assignees: Advics Co., Ltd., Toyota Jidosha Kabushiki KaishaInventors: Masanobu Yamaguchi, Tomohiro Kato, Chiaki Hamada
-
Publication number: 20100070142Abstract: A method of detecting a minispare tire in a vehicle having a vehicle control system. The method includes detecting a rotational velocity of each of a plurality of wheels of the vehicle; determining whether a minispare tire is mounted on the vehicle based on the rotational velocities detected at each of the plurality of wheels; adjusting the vehicle control system if a minispare tire is mounted on the vehicle; sensing a hydraulic pressure of a braking system of the vehicle; and suspending determination of whether a minispare tire is mounted on the vehicle if the hydraulic pressure exceeds a predetermined critical pressure level.Type: ApplicationFiled: September 16, 2008Publication date: March 18, 2010Applicant: ROBERT BOSCH GMBHInventor: Nachiket D. Patil
-
Patent number: 7530648Abstract: The brake hydraulic pressure control apparatus employs, as a pressure-increasing valve, a normally-open linear solenoid valve that can linearly adjust an actual differential pressure (difference between master cylinder hydraulic pressure and a wheel cylinder hydraulic pressure). This apparatus repeatedly executes, in principle, a control cycle in which a pressure-reducing control, holding control and linear pressure-increasing control make one set, while a “linear pressure-increasing control with holding period” is executed instead of the linear pressure-increasing control only in the first-time control cycle that is started in a state where a current-value-corresponding-to-actual-differential-pressure cannot correctly be obtained.Type: GrantFiled: May 11, 2006Date of Patent: May 12, 2009Assignee: Advics Co., Ltd.Inventor: Katsuo Obai
-
Patent number: 7374254Abstract: A method for controlling an electric brake system having a piston moveable by an electric motor is provided. The method includes the steps of storing data for correlating a position of the piston to a braking force applied by the piston, estimating a braking force associated with a specific position of the piston based upon the stored data, generating a control signal based upon the estimated braking force, determining a second braking force associated with the specific position and updating the stored data based upon a difference between the estimated braking force and the second braking force.Type: GrantFiled: December 5, 2005Date of Patent: May 20, 2008Assignee: Delphi Technologies, Inc.Inventor: Jon T. Zumberge
-
Patent number: 7198336Abstract: A vehicular brake control apparatus includes a braked member that rotates together with a wheel, a braking member, an electric driving device that presses the braking member against the braked member to apply a braking torque to the wheel, when being supplied with electric current, an operational state detector that detects an operational state of the vehicle and provides a quantity of state representative of the operational state of the vehicle, a braking torque change request determiner that selectively determines that the braking torque is to be increased and that the braking torque is to be reduced, based on the quantity of state, and a current controller that controls supply of electrical current to the electric driving device so that the electric driving device is caused to drive in a predetermined direction if it is determined that the braking torque is to be increased, and so that the electric driving device does not drive in the predetermined direction if it is determined that the braking torque is tType: GrantFiled: September 28, 2001Date of Patent: April 3, 2007Assignees: Toyota Jidosha Kabushiki Kaisha, Denso CorporationInventors: Takayuki Yamamoto, Naoki Sawada
-
Patent number: 7195323Abstract: The present invention provides an electric brake system in which an actual control variable in the electric brake when overshooting is generated is determined, and the target value is set to a maximum value of the actual control variable in the electric brake when overshooting is generated. Therefore, the target value and the actual control variable will be in agreement with each other before hunting to be generated after overshooting starts. Accordingly, the output of the electric brake is gradually stabilizing at the target value without an oscillation phenomenon as in a related art.Type: GrantFiled: August 5, 2004Date of Patent: March 27, 2007Assignee: Advics Co., Ltd.Inventors: Haruo Arakawa, Takahisa Yokoyama, Takayuki Takeshita
-
Patent number: 7188913Abstract: A vehicular motor-driven brake apparatus includes an open circuit in which reciprocation of a master cylinder generating a brake pressure is caused by an actuator that operates according to a pedal operation amount, and brake fluid discharged from a wheel cylinder during pressure decrease is directly returned to a master reservoir subject to atmospheric pressure. A fluid amount replenishment control is executed during pressure increase of the master cylinder in which a master stroke is returned for only a predetermined time by operation of the actuator, and thus brake fluid is sucked up from the master reservoir to the master cylinder. Accordingly, when an ABS control continues for a long time period, even if the brake pedal is being depressed, reduced pressure brake fluid in the master cylinder is sucked up. Therefore, there is no limit to pressure decrease, and bottoming-out of the master cylinder does not occur.Type: GrantFiled: March 8, 2005Date of Patent: March 13, 2007Assignee: Advics Co., LtdInventors: Takahisa Yokoyama, Takayuki Takeshita, Haruo Arakawa
-
Patent number: 7165818Abstract: In a vehicle attitude control system of an automotive vehicle employing a pump-and-motor assembly, and a hydraulic actuator that regulates fluid pressures in wheel-brake cylinders of road wheels of the vehicle, independently of each other, a control unit is electronically connected to at least a motor of the pump-and-motor assembly and the hydraulic actuator, for executing vehicle attitude control by controlling a discharge pressure of the motor-driven pump and by controlling the fluid pressures in the wheel-brake cylinders to respective desired fluid pressures independently of each other. A processing unit of the control unit is programmed to determine a duty ratio of a drive signal of the motor, based on the desired fluid pressure of at least one of the wheel-brake cylinders.Type: GrantFiled: August 18, 2004Date of Patent: January 23, 2007Assignee: Hitachi, Ltd.Inventors: Katsuya Iwasaki, Kotaro Koyama, Jun Kubo
-
Patent number: 7133796Abstract: The Smart Resolution Valve Pressure Control System allows any pressure control system using valve state pulsing to modify airflow at an optimum and consistent range of operation thereby enhancing control accuracy and increasing the useable cycle life of any valve combination used.Type: GrantFiled: March 24, 2004Date of Patent: November 7, 2006Assignee: Westinghouse Air Brake Technologies CorporationInventors: David E. Schweikert, James A. Wood
-
Patent number: 7004551Abstract: A vehicular motor-driven brake apparatus includes an open circuit in which reciprocation of a master cylinder generating a brake pressure is caused by an actuator that operates according to a pedal operation amount, and brake fluid discharged from a wheel cylinder during pressure decrease is directly returned to a master reservoir subject to atmospheric pressure. A fluid amount replenishment control is executed during pressure increase of the master cylinder in which a master stroke is returned for only a predetermined time by operation of the actuator, and thus brake fluid is sucked up from the master reservoir to the master cylinder. Accordingly, when an ABS control continues for a long time period, even if the brake pedal is being depressed, reduced pressure brake fluid in the master cylinder is sucked up. Therefore, there is no limit to pressure decrease, and bottoming-out of the master cylinder does not occur.Type: GrantFiled: September 2, 2004Date of Patent: February 28, 2006Assignee: Advics Co., Ltd.Inventors: Takahisa Yokoyama, Takayuki Takeshita, Haruo Arakawa
-
Patent number: 6901341Abstract: The Smart Resolution Valve Pressure Control System allows any pressure control system using valve state pulsing to modify airflow at an optimum and consistent range of operation thereby enhancing control accuracy and increasing the useable cycle life of any valve combination used.Type: GrantFiled: March 24, 2004Date of Patent: May 31, 2005Assignee: Westinghouse Air Brake Technologies CorporationInventors: David E. Schweikert, James A. Wood
-
Patent number: 6799132Abstract: The Smart Resolution Valve Pressure Control System allows any pressure control system using valve state pulsing to modify airflow at an optimum and consistent range of operation thereby enhancing control accuracy and increasing the useable cycle life of any valve combination used.Type: GrantFiled: January 8, 2003Date of Patent: September 28, 2004Assignee: Westinghouse Air Brake Technologies CorporationInventors: David E. Schweikert, James A. Wood
-
Publication number: 20040080208Abstract: The invention discloses methods and control systems for controlling an electronically controllable brake actuating system for automotive vehicles, with a depressurized pressure medium supply reservoir (4), with at least one pressure source (20) which can be controlled by an electronic control unit (32), said pressure source being used to apply pressure to the wheel brakes (7,8,9,10) of the vehicle, with pressure sensors and pressure control valves (inlet valve 17,18; outlet valve 27,28) being associated with said wheel brakes, said pressure control valves being controllable in an analog manner by means of an electric variable in dependence on the differential pressure applied to them and connecting the wheel brakes (7-10) to the pressure source (20) in a pressure increase phase, being closed or becoming closed in a pressure maintenance phase and connecting the wheel brakes (7-10) to the pressure medium supply reservoir (4) in a pressure reduction phase.Type: ApplicationFiled: March 27, 2003Publication date: April 29, 2004Inventors: Bernhard Giers, Robert Schmidt, J?uuml;rgen Bhm, Thorsten Ullrich
-
Patent number: 6709073Abstract: A force generating apparatus for providing a force to a moving element based upon receipt of an electrical force signal includes a force applying element coupled to the moving element for applying the force to the moving element and an actuator coupled to the force applying element for actuation thereof in response to receiving the electrical force signal. The force generating apparatus further includes a controller for determining when the force apply element is in an apply mode, determining the elapsed time until reversion to a normal mode, determining when the elapsed time is greater than a predefined minimum, modifying the value of the electrical force signal sent to the actuator, and modifying a stored control parameter.Type: GrantFiled: November 1, 2001Date of Patent: March 23, 2004Assignee: Delphi Technologies, Inc.Inventors: Bryan P. Riddiford, Richard J. Thomas
-
Patent number: 6655756Abstract: The problem of maintaining fluid modulus during a fast mode release of fluid pressure in a force generating apparatus having a force generating actuator fluidically coupled to a force generating device by a fluid circuit having restrictions and resistance to fluid flow is solved by sensing a pressure remotely from an actuator apply chamber, determining an estimated chamber pressure form the sensed pressure, and limiting the rate at which the actuator can reduce fluid pressure in an apply chamber of the actuator to a rate low enough to preclude a change in modulus of the fluid during the fast mode release.Type: GrantFiled: February 22, 2002Date of Patent: December 2, 2003Assignee: Delphi Technologies, Inc.Inventors: Bryan P. Riddiford, Richard J. Thomas
-
Publication number: 20030218380Abstract: A method for determining a variable representing a hydraulic pressure drop across a valve of a brake circuit, in which a control pulse, designed such that abrupt braking pressure changes are suppressed, is applied to the valve, and in which the hydraulic pressure drop across the valve is determined from the knowledge of the control pulse.Type: ApplicationFiled: February 27, 2003Publication date: November 27, 2003Inventors: Juergen Breitenbacher, Rainer Heinsohn, Andreas Klug, Peter Zeiner
-
Publication number: 20030214183Abstract: A method and a device for controlling at least one valve of a brake circuit using an electrical control variable, in whichType: ApplicationFiled: March 12, 2003Publication date: November 20, 2003Inventors: Juergen Breitenbacher, Andreas Klug, Alfred Strehle
-
Patent number: 6502029Abstract: A system and method for ABS stability control is provided, the method comprising the steps of determining whether a first wheel is in an ABS mode; determining whether the first wheel is in an apply mode; determining whether a second parallel wheel is in the release mode; calculating an adjusted wheel slip if the first wheel is in the ABS mode, the first wheel is in the apply mode, and the second parallel wheel is in the release mode; and determining a control mode for the first wheel using the adjusted wheel slip.Type: GrantFiled: January 3, 2001Date of Patent: December 31, 2002Assignee: Delphi Technologies, Inc.Inventor: Kevin A. O'Dea
-
Patent number: 6478386Abstract: A control device for an antilock braking system is disclosed. When a target angle of a crankshaft provided to a servomotor of an ABS that is closer to a turning limit than to a predetermined updating stop angle, the target angle is set at the updating stop angle or the vicinity thereof. An expander piston is displaced to an open end side corresponding to the turning limit of the crankshaft by an elastic force of a return spring after being displaced to a position corresponding to an updating stop angle for the crankshaft or the vicinity thereof. This arrangement permits reliable, accurate displacement of the expander piston to a predetermined position corresponding to a turning limit of the crankshaft without causing the servomotor to consume needless electric current.Type: GrantFiled: March 29, 2001Date of Patent: November 12, 2002Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Atsuo Ota, Shinji Goto
-
Patent number: 6364436Abstract: A brake control device has a master cylinder, wheel cylinder, and a solenoid valve disposed in a conduit between the master cylinder and the wheel cylinder. When a brake pedal happens to be returned at sudden braking, at an idle stop or at vehicle stop on a sloping road, the solenoid valve is controlled at a duty rate based on a difference between a peak value of master cylinder and an actual value of master cylinder reducing so that wheel cylinder pressure is held to a value higher than master cylinder pressure.Type: GrantFiled: November 16, 2000Date of Patent: April 2, 2002Assignee: Denso CorporationInventor: Mamoru Sawada
-
Patent number: 6361128Abstract: Improved control for a hydraulic system useful in automotive braking applications, particularly in dry interface automotive braking applications, includes the use of a valve for holding pressure in a hydraulic system constant while relieving the pressure load on the pressure source. Preferably, the valve is a normally-open solenoid valve that is closed and opened in response to a desired pressure being sensed at a pressure actuated mechanism, such as a brake caliper. The use of the improved control for a hydraulic system improves brake response times during ABS applications, and increases the energy efficiency and life expectancy of the pressure providing motor.Type: GrantFiled: June 30, 1999Date of Patent: March 26, 2002Assignee: Delphi Technologies, Inc.Inventors: Bryan Peter Riddiford, John Benjamin Hageman, Donald Edward Schenk
-
Patent number: 6345869Abstract: A braking pressure control apparatus for a braking system having brake cylinders including a pressurizing device capable of pressurizing a working fluid and controlling a pressure of the pressurized fluid, a plurality of pressure control valve devices each of which is disposed between the pressurizing device and at least one of the brake cylinders and is operable to control flows of the fluid between the pressurizing device and the corresponding at least one brake cylinder, for thereby regulating the fluid pressure in the corresponding at least one brake cylinder, and a pressurizing-device control device operable to control the pressurizing device for controlling an output pressure of the pressurizing device on the basis of an operating state of each of the pressure control valve devices, which operating state determines the state of fluid flow between the pressurizing device and the corresponding at least one brake cylinder.Type: GrantFiled: September 29, 2000Date of Patent: February 12, 2002Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yoshiaki Matsuo, Kiyotaka Motoyoshi
-
Patent number: 6158822Abstract: A method of diagnosing an electrically operated brake for abnormality thereof in an automotive vehicle wherein a wheel is braked by a friction force generated by an electric motor of the brake upon an operation of a brake operating member, the method comprising the steps of: applying an abnormality checking drive signal to the electric motor to operate the electric motor while the brake operating member is placed in a non-operated position; detecting a quantity relating to an output of the electric motor while the drive signal is applied to the electric motor; and determining that the electrically operated brake is abnormal, if the detected quantity does not normally correspond to a magnitude of the abnormality checking drive signal.Type: GrantFiled: December 9, 1998Date of Patent: December 12, 2000Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kenji Shirai, Yasunori Yoshino, Akihiro Otomo
-
Patent number: 6120115Abstract: In a braking energy control apparatus and method for a vehicle equipped with an electric motor, a predetermined amount of braking energy can be achieved, regardless of the charged condition of a battery, when a brake pedal is off. Drive wheels are driven by a drive force from an engine and the motor. A braking energy control device performs ensemble control of a regenerative braking energy control device that controls the motor and a friction braking energy control device that controls liquid pressure supplied to wheel cylinders, and thereby controls the braking energy when the brake pedal is on or off. The coordinate control of regenerative braking energy and friction braking energy is performed not only when the brake pedal is on but also when the brake pedal is off.Type: GrantFiled: November 9, 1998Date of Patent: September 19, 2000Assignee: Toyota Jidosha Kabushiki KaishaInventor: Kouta Manabe
-
Patent number: 5984432Abstract: Hydraulic pressure control apparatus wherein a pressure difference across a seating valve disposed in a fluid passage acts on a valve member for placing the seating valve in an open state, while an elastic member biases the valve member for placing the seating valve in a closed state, and a valve driving device operated with an electric current applied thereto generates a drive force acting on the valve member so as to open the seating valve. A control device for controlling the electric current includes a stepping controller for incrementing the amount of the electric current when the seating valve is operated from the closed state into the open state, such that an increment of the electric current decreases with an increase in the pressure difference. The hydraulic pressure control apparatus may be suitably used in a vehicle braking system, for controlling fluid pressure in wheel brake cylinder.Type: GrantFiled: March 11, 1998Date of Patent: November 16, 1999Assignee: Toyota Jidosha Kabushiki KaishaInventors: Akihiro Otomo, Kiyoharu Nakamura, Fumiaki Kawahata, Akira Sakai, Shinichi Soejima
-
Patent number: 5979997Abstract: A hydraulic brake control apparatus includes a pressure supply inhibiting unit which inhibits supply of a brake fluid pressure to wheel cylinders by a first pressure supplying unit when a defect in a brake fluid path between a first flow control unit and the wheel cylinders has occurred, and inhibits supply of a brake fluid pressure to the wheel cylinders by a second pressure supplying unit when a defect in a brake fluid path between a second flow control unit and the wheel cylinders has occurred.Type: GrantFiled: June 27, 1997Date of Patent: November 9, 1999Assignee: Toyota Jidosha Kabushiki KaishaInventors: Masayasu Ohkubo, Fumiaki Kawahata, Amane Shimura, Hirohiko Morikawa, Akira Sakai, Akihiro Ohtomo
-
Patent number: 5951120Abstract: A hydraulic brake control apparatus in which a master cylinder is connected to wheel cylinders via a master cylinder cut valve, and the wheel cylinders are connected to a reservoir tank via a switching valve, includes a check valve provided between the master cylinder and the wheel cylinders in parallel with the master cylinder cut valve, the check valve provided in a bypass passage of the master cylinder cut valve, the check valve allowing a flow of a brake fluid from the master cylinder to the wheel cylinders and inhibiting a flow of the brake fluid from the wheel cylinders to the master cylinder.Type: GrantFiled: July 21, 1997Date of Patent: September 14, 1999Assignee: Toyota Jidosha Kabushiki KaishaInventors: Amane Shimura, Hirohiko Morikawa, Fumiaki Kawahata, Kiyoharu Nakamura, Akira Sakai, Akihiro Ohtomo
-
Patent number: 5758930Abstract: An electronically controllable anti-lock brake actuation system for automotive vehicles, including a pedal actuated dual-circuit master brake cylinder, and braking pressure generators actuatable by an electronic control unit. Each of the braking pressure generators has a piston slidable in a cylinder bore from an initial position, each piston separating a first working chamber, to which each one wheel brake of the vehicle is connected directly and the master cylinder is connected by way of a closable hydraulic connection, from a second working chamber and is connected to the master cylinder where the stepped piston is operable to achieve a braking pressure generation or boosting.Type: GrantFiled: October 30, 1996Date of Patent: June 2, 1998Assignee: ITT Automotive Europe GmbHInventors: Lothar Schiel, Ulrich Neumann, Hans-Jorg Feigel, Andreas Klen
-
Patent number: 5722744Abstract: In a road vehicle electrohydraulic brake system, each wheel brake is assigned a brake-pressure regulating element which can be controlled by an electric motor. At least one electronic retardation desired-value signal transmitter is actuated by the driver. An electronic control unit produces the required actuating signals for the brake-pressure regulating elements from a comparison of the desired-value input signals with actual-value signals characteristic of the vehicle retardation. The brake-pressure regulating elements each comprises a piston pump. The filling and delivery strokes of these elements are performed in a fixed phase relationship with a pump driving element. The output of the pump per pump cycle is regulated opposite the pressure and, in all cases, is small relative to the output, Q.sub.max, required for coupling the maximum value of the brake pressure P.sub.Bmax into the connected wheel brake.Type: GrantFiled: June 26, 1996Date of Patent: March 3, 1998Assignee: Mercedes-Benz AGInventors: Walter Kupfer, Harry Troester
-
Patent number: 5645143Abstract: An electronically controllable braking system for ground vehicles, comprising a cylinder/piston arrangement (6) which is able to introduce friction forces (F.sub.akt) into a friction element (8) which is coupled with a vehicle wheel by subjecting a hydraulic chamber (4) of the cylinder/piston arrangement (6) with hydraulic fluid, is developed further in that an electrically actuatable displacement element (12) projects into the hydraulic chamber (4) of the cylinder/piston arrangement (6) which is actuatable as a function of control signals from an electronic controller (22) for increasing or decreasing the pressure acting on the hydraulic fluid in the hydraulic chamber (4) in order to increase or decrease, respectively, the friction forces (F.sub.akt) which, during a braking operation, are introduced into the friction element (8).Type: GrantFiled: March 26, 1996Date of Patent: July 8, 1997Assignee: Lucas Industries public limited companyInventors: Kurt Mohr, Ulrich Seuser
-
Patent number: 5627755Abstract: Methods and systems for detecting and compensating for rough roads in an anti-lock brake system (ABS) through the use of a desensitizer factor which is utilized in a slip threshold desensitization circuit to desensitize slip threshold are described. The desensitizer factor is dependent on wheel acceleration. The desensitizer factor normally decays over time as long as the current value of the desensitizer factor is greater than a peak value of wheel acceleration. Otherwise, the desensitizer factor assumes the peak value of wheel acceleration, thereby "capturing" the peaks of wheel acceleration. The system includes a wheel speed sensor for measuring the speed of each of the vehicle wheels, and a control unit for determining whether the anti-lock brake system should be activated based on the value of the desensitized slip threshold. The desensitized slip threshold is utilized by the ABS to compensate for vehicle travel on rough roads.Type: GrantFiled: September 9, 1994Date of Patent: May 6, 1997Assignee: Kelsey-Hayes CompanyInventor: Dan Negrin
-
Patent number: 5597214Abstract: A brake force control device for a vehicle includes a master cylinder generating a brake pressure by operation of an operating member of the vehicle, a wheel brake for being mounted on a vehicle wheel and connected to the master cylinder through a conduit, a pressure control chamber connected to the wheel brake, a displacement actuator which varies the capacity of the pressure control chamber and an electric controller for operating the displacement actuator so as to supply the brake pressure to the wheel brake when the master cylinder does not generate the brake pressure.Type: GrantFiled: December 2, 1994Date of Patent: January 28, 1997Assignee: Aisin Seiki Kabushiki KaishaInventors: Masayoshi Katagiri, Kazuhiko Suzuki
-
Patent number: 5522653Abstract: A switched reluctance motor comprising a stator including a plurality of phase coils, a rotor rotatably mounted coaxially with the stator, a first commutator plate comprising a plurality of first contact plates wherein each phase coil of the plurality of phase coils is electrically coupled to a member of the plurality of first contact plates, a first switching device, a first rotatably mounted brush consecutively providing electrical contact between each first contact plate and the first switching device, a second switching device, a second commutator plate comprising a plurality of second contact plates wherein each phase coil of the plurality of phase coils is electrically coupled to a member of the plurality of second contact plates, a second rotatably mounted brush consecutively providing electrical contact between each second contact plate and the second switching device, wherein, when the first switching device is closed and the second switching device is open, the rotor rotates in a first direction andType: GrantFiled: May 24, 1995Date of Patent: June 4, 1996Assignee: General Motors CorporationInventors: Gary C. Fulks, Michael A. Dimatteo